The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 02, 2014
Filed:
Jul. 15, 2011
Kenichi Yoshimura, Osaka, JP;
Kohsei Takahashi, Osaka, JP;
Hiroshi Fukunaga, Osaka, JP;
Naoto Hirosaki, Tsukuba, JP;
Kenichi Yoshimura, Osaka, JP;
Kohsei Takahashi, Osaka, JP;
Hiroshi Fukunaga, Osaka, JP;
Naoto Hirosaki, Tsukuba, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
National Institute for Materials Science, Ibaraki, JP;
Abstract
There is realized a light-emitting device that emits, with high efficiency, white light with excellent color rendering index. A light-emitting device () of the present invention is a light-emitting device () for emitting white light, including at least a light-emitting element () for emitting blue light, an orange fluorescent material () which absorbs the blue light so as to emit orange light, and a green fluorescent material () which absorbs the blue light so as to emit green light, the orange fluorescent material () being a Ce-activated CaAlSiNfluorescent material in a solid solution crystal form in which Ce and oxygen are dissolved in a crystal having a composition of cCaAlSiN.(1−c)LiSiNwhere 0.2≦c≦0.8, and the orange fluorescent material () containing 2 weight % or more of Ce.